- Cohort 1 (12 patients): Window of opportunity cohort: Patients with a score of at least 4 out of 5 by the OSI-906 integrated classifier who are irinotecan-naive will receive OSI-906 as a single agent until disease progression. Patients must be non surgically resectable or not a surgical candidate because of comorbid conditions. At disease progression, if the patient had a best response of at least stable disease for 3 cycles (9 weeks), irinotecan may be added to OSI-906.